diff --git a/raystack/frontier/v1beta1/frontier.proto b/raystack/frontier/v1beta1/frontier.proto
index c1f162e5..4b2aa830 100644
--- a/raystack/frontier/v1beta1/frontier.proto
+++ b/raystack/frontier/v1beta1/frontier.proto
@@ -1608,7 +1608,7 @@ service FrontierService {
   }
 
   rpc ListBillingTransactions(ListBillingTransactionsRequest) returns (ListBillingTransactionsResponse) {
-    option (google.api.http) = {get: "/v1beta1/billing/{billing_id}/transactions"};
+    option (google.api.http) = {get: "/v1beta1/organizations/{org_id}/billing/{billing_id}/transactions"};
     option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
       tags: "Transaction";
       summary: "List billing transactions";
@@ -1616,6 +1616,15 @@ service FrontierService {
     };
   }
 
+  // Invoice
+  rpc ListInvoices(ListInvoicesRequest) returns (ListInvoicesResponse) {
+    option (google.api.http) = {get: "/v1beta1/organizations/{org_id}/billing/{billing_id}/invoices"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Invoice";
+      summary: "List invoices";
+      description: "List all invoices of a billing account.";
+    };
+  }
 }
 
 // Billing
@@ -1647,11 +1656,16 @@ message GetBillingAccountRequest {
   string id = 1 [(validate.rules).string.min_len = 1];
 
   string org_id = 2 [(validate.rules).string.min_len = 1];
+
+  bool with_payment_methods = 3;
 }
 
 message GetBillingAccountResponse {
   // Billing account
   BillingAccount billing_account = 1;
+
+  // List of payment methods
+  repeated BillingPaymentMethod payment_methods = 2;
 }
 
 message UpdateBillingAccountRequest {
@@ -1827,6 +1841,7 @@ message FeatureRequestBody {
   string plan_id = 4;
   repeated Price prices = 5;
   int64 credit_amount = 7;
+  string behavior = 8;
 
   google.protobuf.Struct metadata = 20;
 }
@@ -1913,6 +1928,17 @@ message UpdatePlanResponse {
   Plan plan = 1;
 }
 
+message ListInvoicesRequest {
+  string org_id = 1 [(validate.rules).string.min_len = 3];
+  // ID of the billing account to list invoices for
+  string billing_id = 2 [(validate.rules).string.min_len = 1];
+}
+
+message ListInvoicesResponse {
+  // List of invoices
+  repeated Invoice invoices = 1;
+}
+
 // Authentication
 
 message GetJWKsRequest {}
diff --git a/raystack/frontier/v1beta1/models.proto b/raystack/frontier/v1beta1/models.proto
index 9abe9e27..321beddb 100644
--- a/raystack/frontier/v1beta1/models.proto
+++ b/raystack/frontier/v1beta1/models.proto
@@ -637,6 +637,7 @@ message Feature {
 
   repeated Price prices = 7;
   int64 credit_amount = 8;
+  string behavior = 9;
 
   google.protobuf.Struct metadata = 20;
   google.protobuf.Timestamp created_at = 21;
@@ -694,6 +695,38 @@ message Usage {
   google.protobuf.Timestamp updated_at = 22;
 }
 
+message Invoice {
+  string id = 1;
+  string customer_id = 2;
+  string provider_id = 3;
+  string state = 4;
+  string currency = 5;
+  int64 amount = 6;
+  string hosted_url = 7;
+
+  // The date on which payment for this invoice is due
+  google.protobuf.Timestamp due_date = 8;
+  // The date when this invoice is in effect.
+  google.protobuf.Timestamp effective_at = 9;
+
+  google.protobuf.Struct metadata = 20;
+  google.protobuf.Timestamp created_at = 21;
+}
+
+message BillingPaymentMethod {
+  string id = 1;
+  string customer_id = 2;
+  string provider_id = 3;
+  string type = 4;
+  string card_brand = 15;
+  string card_last4 = 16;
+  string card_exp_month = 17;
+  string card_exp_year = 18;
+
+  google.protobuf.Struct metadata = 20;
+  google.protobuf.Timestamp created_at = 21;
+}
+
 // Model crud body
 
 message RoleRequestBody {